See Figure $1.$o$.$ for a UML class diagram of

Automobile and Object classes, consider following

code:

Object o $=$ new

Object$()$;

Automobile auto

$=$ new Automobile$()$;

Object autoObj $=$ new Automobile$()$;

auto.equals$($o$)$;

auto.equals$($auto$)$;

auto.equals$($autoObj$)$;